feat: Convert all mutation files to js

packages/backend/src/graphql/mutations/login.js

@@ -0,0 +1,17 @@
+import User from '../../models/user';
+import createAuthTokenByUserId from '../../helpers/create-auth-token-by-user-id';
+
+const login = async (_parent, params) => {
+  const user = await User.query().findOne({
+    email: params.input.email.toLowerCase(),
+  });
+
+  if (user && (await user.login(params.input.password))) {
+    const token = createAuthTokenByUserId(user.id);
+    return { token, user };
+  }
+
+  throw new Error('User could not be found.');
+};
+
+export default login;